3K0Q

Cryogenic structure of CypA mutant Ser99Thr (2)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.32 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Hidden alternative structures of proline isomerase essential for catalysis.

Fraser, J.S.Clarkson, M.W.Degnan, S.C.Erion, R.Kern, D.Alber, T.

(2009) Nature 462: 669-673

  • DOI: 10.1038/nature08615
  • Primary Citation of Related Structures:  
    3K0P, 3K0Q, 3K0R, 3K0M, 3K0N, 3K0O

  • PubMed Abstract: 
  • A long-standing challenge is to understand at the atomic level how protein dynamics contribute to enzyme catalysis. X-ray crystallography can provide snapshots of conformational substates sampled during enzymatic reactions, while NMR relaxation metho ...

    A long-standing challenge is to understand at the atomic level how protein dynamics contribute to enzyme catalysis. X-ray crystallography can provide snapshots of conformational substates sampled during enzymatic reactions, while NMR relaxation methods reveal the rates of interconversion between substates and the corresponding relative populations. However, these current methods cannot simultaneously reveal the detailed atomic structures of the rare states and rationalize the finding that intrinsic motions in the free enzyme occur on a timescale similar to the catalytic turnover rate. Here we introduce dual strategies of ambient-temperature X-ray crystallographic data collection and automated electron-density sampling to structurally unravel interconverting substates of the human proline isomerase, cyclophilin A (CYPA, also known as PPIA). A conservative mutation outside the active site was designed to stabilize features of the previously hidden minor conformation. This mutation not only inverts the equilibrium between the substates, but also causes large, parallel reductions in the conformational interconversion rates and the catalytic rate. These studies introduce crystallographic approaches to define functional minor protein conformations and, in combination with NMR analysis of the enzyme dynamics in solution, show how collective motions directly contribute to the catalytic power of an enzyme.


    Organizational Affiliation

    Department of Molecular and Cell Biology/QB3, University of California, Berkeley, California 94720-3220, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cyclophilin AA165Homo sapiensMutation(s): 1 
Gene Names: PPIACYPA
EC: 5.2.1.8
Find proteins for P62937 (Homo sapiens)
Explore P62937 
Go to UniProtKB:  P62937
NIH Common Fund Data Resources
PHAROS  P62937
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.32 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.523α = 90
b = 52.132β = 90
c = 89.105γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-12-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2013-06-19
    Changes: Database references
  • Version 1.3: 2017-11-01
    Changes: Refinement description